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The past 30 days have featured a wetter than normal weather pattern across the Pacific Northwest, Northern Rockies/Plains, & Midwest. The precipitation footprints from Dorian, Imelda, & remnants of Lorena are also visible. Many southeastern regions were abnormally to historically dry.

The 30 day departures

Attached is September's precipitation-to-date rankings through the 25th. Green Bay, & Salem, OR witnessed their wettest Sept 1-25 on record. Conversely, it's the first time on record that Knoxville, TN and Tallahassee, FL have not reported measurable rainfall through the first 25 days of September.

It's really interesting to see how a pattern that brings so much rain to one area can keep another bone dry. These are the September rainfall rankings for some select cities in the central U.S. Dubuque with 12.1" is ranked 2nd all-time for wettest September. Louisville, Kentucky with .04" is currently experiencing their all-time driest.

Pretty wild how a distance of 490 miles can make a foot difference in rainfall in just a matter of 25 days.

It's quite clear that the ring of fire (storm producing jet stream) has been situated over the Midwest bringing the persistent rains. Underneath a sprawling high pressure ridge, subsidence has kept the southeast hot and dry. Here's an example of the overall pattern at 500mb.

Another example using precipitation departures.